Quick answer: Spray foam insulation in Spartanburg costs $1.00–$1.60 per board foot for open-cell and $1.60–$2.60 per board foot for closed-cell. Full scopes are quoted from measured board feet after an on-site evaluation of thickness, access, prep, and existing insulation. Most jobs finish in one day. Final pricing depends on access, required thickness, and any removal of existing insulation.
Spray Foam Insulation in Spartanburg, South Carolina
If you own a house in Converse Heights, Hampton Heights, Duncan Park, or Una, you already know Spartanburg homes do not all behave the same. A historic home near Converse Heights has different problems than a mill-village house with a low crawl space, and both are different from newer construction tied to Greenville-Spartanburg and the BMW plant. The common thread is air leakage. The Upstate gets humid summers, cold snaps, and enough attic heat to show up on the Duke Energy or Broad River Electric Co-op bill.
We install spray foam in Spartanburg homes where ordinary fiberglass has stopped doing useful work. In older houses around Hampton Heights and Duncan Park, the issue is often a mix of settled attic insulation, open rim joists, and crawl space moisture. In Una and other older working-house neighborhoods, we see vented crawl spaces that have been pulling humid air under the floors for decades.
Why Spartanburg homes need spray foam
Spartanburg sits inland, so homeowners get a wide range of weather — hot summers and cold winter nights alike. Summer attic temperatures climb hard, and winter nights expose every gap around the sill plate. The house may look solid from the street, especially in older brick neighborhoods, but the building envelope is often full of small openings that add up.
Older mill-village and historic housing stock around Spartanburg was not built with modern air sealing in mind. Fiberglass batts can slow heat transfer when they stay dry and perfectly fitted. They do not stop humid air from moving through gaps, and they do not fix a crawl space that smells damp after a stretch of rain.
South Carolina sits in IECC Climate Zone 3A, and the attic carries the highest insulation target of any assembly in the house. That target matters, but R-value alone is not the whole job. Closed-cell foam runs about R-6 to R-7 per inch, while open-cell foam runs about R-3.5 to R-4 per inch. Closed-cell is useful where moisture resistance and high R-value in limited space matter. Open-cell can work well where the main need is air sealing and thermal performance.
Our spray foam services in Spartanburg
Crawl space spray foam
For many Spartanburg homes, the crawl space is the first place we look. Vented crawl spaces in Hampton Heights, Duncan Park, and Una can pull damp air under the living space all summer. Once that air hits cooler floor framing, it leaves moisture behind. Closed-cell spray foam on crawl space walls and rim joists helps control that movement while adding insulation at the foundation edge.
Before spraying, our crews check access, the condition of existing insulation, the foundation walls, and whether old material needs to be removed.
Attic spray foam
Spartanburg attics can punish ductwork. If ducts and air handlers are sitting in a vented attic, the HVAC system is working in some of the hottest air in the house. Spray foam at the roof deck can bring that attic closer to the conditioned space, reduce air leakage, and help the home hold temperature more evenly.
Some homes need targeted air sealing and added insulation at the ceiling plane. Others are better candidates for an unvented spray-foamed roof deck. The decision depends on the roof assembly, ventilation, HVAC layout, and existing insulation.
Rim joist and foundation walls
The rim joist is a common weak point in Spartanburg houses. It sits at the edge of the floor system, right where outside air likes to enter. In older homes, it may be uninsulated or stuffed with fiberglass that has pulled away from the framing. Closed-cell foam is a strong fit here because it seals air gaps and provides solid R-value in a narrow space.
What does spray foam cost in Spartanburg?
Spray foam in Spartanburg is priced by board foot. Open-cell spray foam generally runs $1.00-$1.60/bf. Closed-cell spray foam generally runs $1.60-$2.60/bf. The final price depends on access, foam thickness, the product selected, and whether existing insulation has to be removed before we can install cleanly.
Federal 25C insulation tax credit rules changed after 2025. The 25C credit expired Dec 31 2025, so no federal credit currently applies. Some utility rebate programs may still support qualifying insulation or air-sealing upgrades, but amounts vary and change annually. Confirm current rebate details before an estimate.
